What about cucumber seedlings?

Cucumber is one of the main vegetables in summer in China. Its taste is crisp, tender and refreshing, and its fragrance is sweet, so it is very popular among people. In recent years, the planting area of cucumber in China is also expanding, especially when there is a relative lack of vegetables in winter, cucumber planting is welcomed by growers. So what if cucumbers become infested in the process of planting?

I. main insect pests of cucumbers and their control

The main pests of cucumber are red spiders, aphids, whitefly, tea yellow mite, leaf miner and so on. When pests occur, it is necessary to identify the varieties of pests and take targeted drugs for treatment.

Red spiders are mostly born on the back of the leaves, sucking juice, serious leaves into many small white spots, leaves yellowing, growth inhibition, affecting the normal melon. The ideal effect can be achieved by using 40% diclofenac EC, 20% diclofenac EC and 2000 times EC.

Aphids generally live in groups on the back of the leaves, stem or stem tip, sucking juice, resulting in leaf curl, cucumber growth inhibition, so that the leaves withered and yellow and died. During drought, most of the aphids are the vectors of major viral diseases, and the harm is more serious. 2.5% deltamethrin EC 3000x spray, 40% chrysanthemum horse EC 3000x spray, every 7-10? Spray once every day.

White whitefly live in groups like aphids on the back of the leaves, sucking juice, secreting dense dew on the leaves, polluting the leaves and affecting the photosynthesis of cucumbers. ? The control method is to spray 2.5% bifenthrin EC (Uranus) 1500-2000 times. It is also possible to use imidacloprid 2000 × 3000 times or 2.5% deltamethrin 1000 / 1500 times. In case of continuous cloudy days and rainy seasons, fumigant can be used for control when the population number of powdery mildew is large.

Tea yellow mites are mainly young mites that suck the juice of tender parts such as undeveloped leaves, buds and flower buds. After the injury, the leaf stiffened and thickened, the back of the leaf was yellow-brown and oily, and the leaf margin was rolled back. The young stem is twisted or bald and the bud is deformed. During the control, 3000 times solution of insect mite kexing, 2% avermectin EC or 3000-4000 times solution were sprayed once every 10 days, focusing on the back of leaves, tender stems, buds and young fruits.

After hatching, the larvae will latent feed on the mesophyll, showing zigzag food marks. At the seedling stage, the leaves suffer more, and the serious hidden marks are covered, resulting in yellowing, scorching or shedding of the leaves. Drug prevention and treatment can use 5% Regent suspension, 50 × 100 ml / mu, 40% Qixingbao EC 600 × 800 times, the control time is in the peak period, 5-7 days once, continuous prevention and control 2 times 3 times.

The above are the main pests of cucumbers. After cucumber infestation, we should determine the types of pests as soon as possible according to the symptoms, and then prescribe the right medicine for too long, resulting in low yield of cucumbers.